Well, it depends. If you run your games at a monitor with the resolution 1280x1020 or less*, you might see a bottleneck, and this is because the lower the resolution, the less is demanded out of your GPU and the more your difference in FPS-rate relies on your CPU. I.e. if you run a monitor with e.g. 1680x1050 (this is a very common resolution) I wouldn't think that you would experience any kind of bottleneck.
If you're still worried, or by any chance still think you experience a bottleneck, I would suggest that you exchange that stock cooler with a Corsair H50 or H70 and overclock the hell out of your CPU. You can come back here and look up a guide if that's a problem
Edit* At lower resolutions you wouldn't notice the bottleneck if you didn't look for it, your FPS will be sky-high anyway.